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Had a quick look in my new invertebrates book and think they are Limnopilos naiganetri! If so it says temperature 24 to 28, Ph 7.5 - 8.5. They should be given driftwood and floating plants. It also says that although they carry eggs, raising the young has not been done in captivity (book produced 2015). This youtube video says she has had breeding though????
https://www.youtube.com/watch?v=aPOIq4AsZCE
I had thought about getting some in the past but as she says they are a bit like spiders so that put me off................
Hope everything else is going well still!
Simon

I'm really happy, finally a local shop in Hong Kong had some of these crabs, not to sure which variation of the spider crabs,, but they advertised them as miniature spider crabs (Limnopilos naiyanetri) , I was going to bring them back from Taiwan if I find any, but no need now, got them for about GBP 13.50 for 10 crabs, I will pick up another 30 crabs in the next few day.
The first photo is the crabs in the bag, I won't get home till tmr, the second photo is taken at the shop.

You can do large water changes, I do it every 6 months to reset the minerals in the water, but you cannot just dump the new water back into the tank. It needs to be fed in slowly. I drip in the new water after adjusting it to match previous parameters.

Shrimp don't need much of a water change as they are low bioload! I have 30L and only do 2L per week so as with JayC cut back on the water change amount, even .5 litre would be ok! Large water changes tend to trigger moulting so they may be moulting too often?
They may drop the eggs if they aren't fertilised and therefore unwanted!
Have you seen any that look to be able yet?
Simon